I find that my buttons - males or females - are very quiet, as long as they are happy. I currently have 8 buttons in my living room but only hear a few, not too loud calls a day. Main issue is actually that one of my males tends to boink at night. His cage has soft mesh at the top so he's not getting hurt but my bedroom is on the other side of the wall his cage is placed against so I hear it every time. His girlfriend had chicks a few weeks ago and for the entire time they were raising the chicks, he didn't boink once. I removed the chicks when they were about 6 weeks old and back to boinking he went.. I have a night light in the living room and I think that's adding to the problem but once he's started boinking I can't bring myself to turn it off because I don't think he can find his way back to his girlfriend without it. I'll try to turn off all light at the same time tonight and see if it helps, but I'm not expecting too much..
With regards to missing feathers, that can be caused either by boinking or by another bird pecking her. Make sure their cage is boink proof and that they are not pecking each other, then the feathers should grow back soon.
Remember to feed them a good gamebird feed with at least 20 % protein and supply them with ground oyster shell or similar for extra calcium. Apart from being smaller and more skittish, they are quite similar to coturnix.